package com.etc.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class EmpLoginFilter
 */
@WebFilter("/EmpLoginFilter")
public class EmpLoginFilter implements Filter {

    /**
     * Default constructor. 
     */
    public EmpLoginFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse res = (HttpServletResponse)response;
		res.setContentType("text/html;charset=utf-8");
		String url = req.getServletPath();
		HttpSession session = req.getSession();
		if(session.getAttribute("emp")!=null) {
			//放行
			chain.doFilter(request, response);
		}else {
			//如果没有登录,就跳转到登录页面
			if("/login.jsp".equals(url) || "/login.jsp".equals(url)) {
				chain.doFilter(request, response);
			}else {
				res.getWriter().print("<script>location.href='/fras/login.jsp'</script>");
			}
		}
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
